Bio:Gim Allon was mutated by a radioactive meteorite which gave him the ability to increase his size up to 25 feet. Following this incident, his parents encouraged him to join the Legion of Super-Heroes.

Gim had a long-time crush on fellow Legionnaire Shrinking Violet which was largely unreciprocated. For a brief time, Violet was impersonated by a shapeshifter named Yera who Gim then fell in love with and eventually married.

Gim's mother Marte Allon was the president of Earth following the Great Darkness Saga.